Zirconium-niobium alloy partitioned bone trabecula uni-compartment tibial plateau containing oxide layer and preparation method

Abstract

The invention discloses a zirconium-niobium alloy partitioned bone trabecula uni-compartment tibial plateau containing an oxide layer and a preparation method. The preparation method comprises the steps that zirconium-niobium alloy powder serves as a raw material, an intermediate product of the zirconium-niobium alloy partitioned bone trabecula uni-compartment tibial plateau containing the oxide layer is obtained through 3D printing integral forming, and through hot isostatic pressing and cryogenic oxidation, the zirconium-niobium alloy partitioned bone trabecula uni-compartment tibial plateaucontaining the oxide layer is obtained. A bone trabecula is arranged on the lower surface of a semi-tibial plateau support and the surface of a semi-oval keel with a long round hole, a gradient distribution bone trabecula structure is arranged, micro-motion between a prosthesis and a bone interface can be reduced, the stress shielding effect of the prosthesis on a bone tissue is reduced, so thatthe tibial plateau is uniform in bone tissue stress, the bone ingrowth performance is excellent, and the initial stability and the long-term stability are improved. The bone trabecula is integrally formed through 3D printing, the problem that a complex structure cannot be prepared through traditional machining is solved, the bone trabecula and a solid body are high in bonding strength and not prone to falling off, and the service life of the prosthesis is prolonged.

Description

technical field [0001] The invention belongs to the field of artificial joints, in particular to a zirconium-niobium alloy partitioned trabecular single-compartment tibial platform containing an oxide layer and a preparation method thereof. Background technique [0002] The unicompartmental knee prosthesis is used for surface replacement of the unilateral diseased compartment of the knee joint. It not only has a small surgical incision, less osteotomy during the operation, but also does not affect or less affects other normal joint compartments, and does not damage the knee extension. The device can preserve the cruciate ligament and cartilage, so the recovery after unicompartmental knee replacement is fast, with few complications, and the normal movement and proprioception of the knee joint are preserved. [0003] At present, unicompartmental knee prosthesis can be divided into bone cement fixation and biological fixation according to different fixation methods. Bone cemen...

AI Technical Summary

Problems solved by technology

At present, the biological unicompartmental knee prosthesis is mostly double-coated (titanium microporous + HA coating), which has the risk of coating peeling and uneven coating thickness, which will affect the long-term fixation of the prosthesis.

In addition, the main reason for the failure of artificial joint replacement is the loosening of the prosthesis. The stress shielding caused by the huge stiffness mismatch between the prosthesis and the bone will cause bone remodeling around the prosthesis and lead to prosthesis loosening

The elastic modulus of the existing biological unicompartmental knee prosthesis is much larger than that of bone tissue, which greatly increases the stress shielding effect between the prosthesis and the bone interface, reduces the formation of osteoblasts, and eventually leads to loosening of the prosthesis

3D printing homogeneous trabecular bone unicompartmental knee prosthesis can reduce the stress shielding effect to a certain extent and improve the long-term survival rate of the prosthesis. Due to the mechanical differences of bone tissue in different regions and the mechanical Environmental differences will cause uneven fixation of uniform trabecular bone prosthesis, which will have a certain impact on the long-term stability of the prosthesis and will also increase the risk of failure

However, the solid part of 3D printing products is prone to problems such as uneven microstructure and internal defects, and the mechanical properties are not good; the powder in the structure of the trabecular bone is not well sintered, and the mechanical properties are poor.

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